Friedrich Ernst Dorn
German physicist
Died when: 68 years 142 days (820 months)Star Sign: Leo
![Friedrich Ernst Dorn](http://commons.wikimedia.org/wiki/Special:FilePath/DORN_Friedrich_Ernst.jpg?width=300)
Friedrich Ernst Dorn (27 July 1848 – 16 December 1916) was a German physicist who was the first to discover that a radioactive substance, later named radon, was emitted from radium.
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